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SMALL SIGNAL SBS - AMPLIFICATION

机译：小信号SBS - 放大

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The amplification of small signals was investigated both experimentally and theoretically. The theoretical analysis was provided in terms of unsaturated regime. It is shown, that it is necessary to take into account the temporal shapes of interacting waves. When pump pulse duration is of the order of hupersound phonons lifetime, the Stokes pulse has duration in two times lower then pump. It is necessary to have time delay between input Stokes pulse and pumping pulse of the order of life time of hupersound phonons to have amplification maximum. Energy amplification approx2(centre dot)10~(9) was obtained experimentally when the energy of input signal was about 10~(-11) J. The affect of the active medium SBS - amplifier parameters on SBS threshold is investigated. The universality of expression for a threshold increment of amplification, valid in a big range of change of parameters is shown. The threshold increment of amplification in the light guide in which spontaneous noise can amplify in big solid angle is experimentally confirmed. Experiments on SBS amplification in the light guide of small signal images are carried out. Amplification coefficient approx10~(6) is obtained without essential change of picture quality.
机译：实验和理论上研究了小信号的放大。理论分析是在不饱和制度方面提供的。结果表明，有必要考虑相互作用波的时间形状。当泵脉冲持续时间寿命寿命的顺序时，Stokes脉冲的持续时间在下部的两倍下泵送。有必要在输入斯托克斯脉冲之间具有时间延迟，并泵送HuperSound声子的寿命顺序的泵送脉冲，以具有放大最大值。当输入信号的能量约为10〜（11）J时，通过实验获得能量放大约2（中心点）10〜（9）。研究了SBS阈值的活性培养基SBS放大器参数的影响。显示了阈值增量的表达式的普遍性，显示了在参数的大范围内有效。实验证实了在其中在大实角度放大的光导中放大的阈值增加。执行小信号图像光导中SBS放大的实验。放大系数约10〜（6）在没有图像质量的基本变化的情况下获得。

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